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6 Dolby

Media Meter 2 User’s Manual

Measuring Loudness

Choosing a Measurement Precision

Youcan change thedisplaytoshowmeasurementsintenthsorintegers(units).Tomake

thischange,right‐clickthemeasurementpaneshowninFigure 3‐2,thenchooseUnitsor

Tenthsfromthedisplaycontextmenu.Thecurrentsettingismarked.

Figure3‐2 

Figure 3-2 Measurement Pane Showing Tenths

3.2 Measurement Modes: Short Term vs Infinite

TheDolbyMediaMeter2hastwomodesrelatingtothemeasurementperioditself:Infinite

modeandShort‐Termmode.Thefollowingsectionsdescribetheirbehavior.

3.2.1 Infinite Mode

Infinitemode

istypicallyusedwhenitispossibletomeasuretheentiredurationofthe

program(forexample,all30secondsofacommercialoracompletetwo‐hourmovie).

Infinitemodeprovidesthemostaccuratemeasurement,asitisabletoaverageloudness

overthecompleteprogramlength.Thismodeismostof

tenusediningest,qualitycontrol

(QC),andpostproductionapplicationswhereaudiometadataisbeingauthoredandlevels

can,inmostcases,becontrolledandadjusted.

ItisalsopossibletouseInfinitemodetomeasureshorterindividualsectionsofaprogram

ratherthantheentireduration.Thismethodmayallowtheoper

atortofindameasurement

valuemuchmorequickly.Inthiscase,however,theoperatormustensurethattheloudness

levelsofthesectionsbeingmeasuredarerepresentativeoftheentireprogram.

3.2.2 Short-Term Mode

Short‐Termmodedisplaysthemeasuredvalueforthepreviousfewsecondsasa“sliding

window”typeoffunction.UsingDialogueIntelligence,forexample,the firstmeasurement

valueisforthetimebetween0and10seconds,thenextbetween1and11seconds,next

between2and12seconds,andsofo

rth.UsingEBUR128,themeasurementsareforthree

seconds,ratherthanten.

AstheShort‐Termmodemeasuresonlytheimmediatelyprecedingtensecondsofprogram

material,themeasurementvaluehasthepotentialtobemuchmoredynamicthanthevalue

EBUR128usesthetermIntegratedinsteadofInfinite.

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Dolby Laboratories Program Optimizer DP600 Manuel d'utilisateur Page 10